42 lines
806 B
JavaScript
42 lines
806 B
JavaScript
/**
|
||
* 词法解析器的token
|
||
* */
|
||
|
||
export const types = {
|
||
apostrophe: 'apostrophe', // 单引号
|
||
leftBracket: 'leftBracket', // 左括号
|
||
rightBracket: 'rightBracket', // 右括号
|
||
comma: 'comma', // 逗号
|
||
commonOperator: 'commonOperator', // 普通操作符
|
||
letterOperator: 'letterOperator', // 字母操作符，例如in like
|
||
connection: 'connection', // 连接符 and和or
|
||
commonStr: 'commonStr' // 字符串
|
||
}
|
||
|
||
export default class Token {
|
||
constructor (type, value) {
|
||
this.type = type
|
||
this.value = value
|
||
this.start = 0
|
||
this.end = 0
|
||
this.next = null
|
||
this.prev = null
|
||
}
|
||
|
||
setStart (start) {
|
||
this.start = start
|
||
}
|
||
|
||
setEnd (end) {
|
||
this.end = end
|
||
}
|
||
|
||
setNext (token) {
|
||
this.next = token
|
||
}
|
||
|
||
setPrev (token) {
|
||
this.prev = token
|
||
}
|
||
}
|